MPEG-4 is a form of MPEG encoding. It is a flexible audio and video compression format. The format describes audio and video compression, with a container format for streaming across networks and saving to disk. It also contains optional extra features, including DRM and subtitles. These extra features are only included in software if needed. MPEG-4 can provide better quality than MPEG-2 at low bitrates.
Here is an example of how to transcode an AVI into an MPEG-4 video from the command prompt
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MPEG-4 audio is an advanced, complicated audio format. It includes AAC for high bitrates, multilingual tracks, text-to-speech modes for very low bitrates, the ability to synthesize instrumental sounds (similar to MIDI), and more.
- 2Container
- 2.1.mp4 audio
- 3Container
Codecs
mp4a | This is an audio codec. The name to use at the command line is mp4a, but you can also use m4a. This codec can be used inside the MPEG-4 containers. This codec is from the avcodec module. |
This is a video codec. The name to use at the command line is mp4v, but you can also use m4v. This codec can be used inside the MPEG-4 containers. This codec is from the avcodec module. |
MPEG-4 specifies a range of codecs
The fourccs of MPEG-4 codecs are:
- DivX Codecs
- DIV1, div1, DIVX, divx, DX50, dx50, XVID, XviD, xvid
- FFMPEG MPEG-4
- FMP4, fmp4
- 3IV2, 3iv2
- BLZ0
- DXGM
- HDX4, hdx4
- M4S2, m4s2
- MP4S, mp4s
- MP4V, mp4v
- RMP4
- SEDG
- SMP4
- UMP4
- WV1F
- XVIX
Container
MP4 (.mp4) is the global file extension for the official container format defined in the MPEG-4 standard (ISO 14496-14).
- .mp4: the only official extension; used for both audio and video files (and advanced content)
- .3gp: this extension is used for the 3gp format, derived from the ISO standard
- .m4a: introduced by Apple for aac/alac audio-only files.
NOTE: .m4a files can safely be renamed to .mp4—but the distinction between audio (m4a) and video (mp4) may be useful if you are going to share files, or if you tend to forget what files you have.
For complete details on MP4, see the following link:
.mp4 audio
.m4a is the file extension attached to names of files containing MPEG-4 Audio. Generally, MPEG-4 files are have the .mp4 file extension.
The .m4a file extension has been popularized by Apple, which started using the .m4a file extension in their iTunes software and iPod music players to distinguish between MPEG-4 Video and Audio files. Currently, most software that supports MPEG-4 Audio also supports the .m4a extension. The most common type of .m4a files available are those using the AAC (Advanced Audio Coding) audio format, but other formats such as Apple Lossless and even mp3 files may be put inside a .m4a container file. You can normally safely rename the file extension of an .mp4 file containing only audio to .m4a or vice versa to get the file to properly play in your favorite audio player.
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Protected MPEG-4 Audio
When these files have digital restrictions management (DRM) applied to them, their extension are often changed to .m4p, the p standing for protected. Adobe pdf viewer mac download. Music files purchased from the iTunes Music Store, for example, have this extension.
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Audiobooks
When they contain audiobook data, MPEG-4 files have a .m4b extension.
Container
mp4 | VLC can encode and decode this container. The module name to use at the command line is mp4, but you can also use mov, or 3gp. |
Accepted video codecs
- mp4v, including all the codecs described above
Accepted audio codecs
- mp4a (is aac)
Accepted subtitle codec
Decoding libraries
In addition to FFmpeg, there is MPEG4IP that can decode MPEG-4 streams.
Source code
- modules/mux/mp4/mp4.c (output muxer)
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- modules/demux/mp4/mp4.c (input demuxer)
Further reading
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Retrieved from 'https://wiki.videolan.org/index.php?title=MPEG-4&oldid=61389'
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Useful VLC Media Player features you might not know about VLC Media Player can play any video or audio format, including MPEG, WMV, AVI, MOV, MP4, MKV, H.264/AVC, FLV, MP3 and OGG, along with many others. It also supports Blurays, DVDs, VCDs, and several different streaming formats. Additionally, VLC Media Player is capable or reading incomplete files if they are corrupted or partially downloaded.
The application also supports several subtitle formats, like SRT, ASS, and other files extracted from disks. It allows you to customize the style, size, and placement of the subtitles on the screen.
The interface is plain, but you are able to customize it with the skins that are available. Because VLC Media Player can be run by command-line interface, Telnet, or a web navigator, its functionality goes above and beyond that of other media players.
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